This feature work on Bulk Reports and in your Blacklist Monitors list from your client area.

The best practice here is, when you’ve cleaned several IPs (or even blocks) that are listed on multiple RBLs, you can use this feature when asking for delisting.

For instance, you’re monitoring 10k IPs, but 400 of them are listed on several RBLs, you’ve cleaned them all and you’ll want to start delisting them now. You start filtering them all based on RBLs, select (for instance) Spamhaus RBL and our system will show you all of your IPs listed on Spamhaus, most surely not all 400 of your IPs will all be listed there, so you’ll want to see just those that are. You can then move onto another RBL and filter your IPs based on that one, in order to see just the IPs listed there, then proceed with the delisting from that RBL.

Why would it be easier to delist all IPs on each RBL instead of delisting all RBLs for each IP?

Well, for one some RBLs you can ask for delisting for multiple IPs at a time, in which case, once you’ve got your filtered IPs you can simply ask delisting for all of them at once on that particular RBL, and that’ll be pretty much it. Now, of course this all depends on the RBL, since different RBLs have different delisting policies.